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ID:58730600
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时间:2020-10-04
《电气工程及其自动化专业英语ppt课件.ppt》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、电气工程及其自动化专业英语SpecializedEnglishforElectricalEngineering&ItsAutomation戴文进主编杨植新副主编Part2ElectricMachineryUnit11TheTransformeronNoLoadUnit13ConstructionandApplicationofD.C.MachinesUnit16Three-PhaseInduction(Asynchronous)MachinewiththeRotoratStandstill·Unit19ArmatureReactionofSalient-PoleSync
2、hronousMachineaTwo-ReactionTheoryUnit11TheTransformeronNoLoad-SpecializedEnglishWordsincloseproximity(to)紧密耦合permeability磁导率magnetizingcurrent激磁电流powercomponentofcurrent电流的有功分量sinusoidalvariations正弦变量amutuallyinducede.m.f.互感电动势theappliedvoltage外施电压zero-power-factor零功率因数theno-loadpowerfa
3、ctor空载功率因数formulate用公式表示,系统地阐述saturation饱和Unit11TheTransformeronNoLoadTheSimpleTwo-CoilTransformerThetransformerisastraightforwardapplicationofFaraday'sLawofElectromagneticInduction.Thesimpletransformerconsistsoftwocoilsincloseproximity.OnecoilofN1turnsisexcitedwithalternatingcurrentandt
4、hereforeestablishesafluxφ11whichalternateswiththecurrent(随时间交变).Theothercoilislinkedby(与---交链)mostofthisfluxandthushasamutuallyinducede.m.f.ofvaluee2=-N2dφ21/dt.Thise.m.f.woulddrivealoadcurrentthroughanycircuitconnectedtotheterminalsofthesecondcoil.Energywouldthenbetransferredthroughthem
5、ediumofthemagneticfield(磁场媒介)fromcoil1tocoil2.Thetransformationcouldbefromanyconvenientinputvoltagetoanyconvenientoutputvoltage.Thisapparentlysimplefunctionofthetransformermakesitasvitaltomodernindustryasthegeartrainwhich,asa“transformer”ofspeedandtorquerepresentsaninterestinganalogy(句子的
6、主语是“function”,谓语为“make”,“asvital…as”意为“与……一样重要”,“which”引导一个定语从句“whichrepresentsaninterestinganalogyasa‘transformer’ofspeedandtorque”,修饰“geartrain”,意为“齿轮箱与变压器表现出一种有趣的相似,齿轮箱被称为速度和转矩的‘变换器’。”Thecoilswouldbeonanironcore(铁芯)andsoatthecostofintroducingironlosses,thevalueoffluxperampereisincreas
7、edseveralhundredtimesbecauseofthechangeofpermeabilityfromμ0toμ0μr.Theexcitingormagnetizingcurrent(励磁电流)canthusbeverysmall.Further,theproportionofthetotalfluxwhichislinkedmutuallybythetwocoilsisgreatlyincreased.Lookedatanotherway,theleakagefluxΦ1whichlinksN1turnsaloneand
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